It was mentioned that this was only a quick work...for sure they need to put a lot of work into this to get things right...(of course if they really want...currently I'm not sure if this is just a gag and won't be enhanced or updated by them)...

Regarding the bike physics: A quad is not a bike. With the current engine it's not possible to simulate bikes (despite those with four wheels ). Anyhow ISI never said their engine won't able to handle bike physics (when added the currently missing parts of the simulation).

Ok, I downloaded the quads and the Track, but i do not see them after unpacking them in the sim. I tried single player and went to the race setup but no joy I went to the ISI all cars and tracks and looked at every mod... so the question is... where are they?